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NEET 2022
Exam
NEET
Year
2022
Subject
Physics
Chapter
Ray Optics

NEET 2022 · Physics · Ray Optics

A biconvex lens has radii of curvature 20cm each. If the refractive...

A biconvex lens has radii of curvature 20cm20cm each. If the refractive index of the material of the lens is 1.51 . 5, the power of the lens is:

Options

  1. A+20D+ 20D
  2. B+5D+ 5D
  3. Cinfinity
  4. D+2D+ 2D

Correct answer

B. +5D+ 5D

Step-by-step solution

Power of the lens is,

P=1f=(μ−1)(1R1−1R2)⇒P=(1.5−1)(10.2−1−0.2)=0.5×10⇒P=+5DP = \dfrac{1}{f} = \left(\mu - 1\right)\left(\dfrac{1}{{R}_{1}} - \dfrac{1}{{R}_{2}}\right) ⇒ P = \left(1 . 5 - 1\right)\left(\dfrac{1}{0 . 2} - \dfrac{1}{- 0 . 2}\right) = 0 . 5 \times 10 ⇒ P = + 5D

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